package com.heima.common.intercepetor;

import com.heima.utils.common.UserContext;
import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.core.tools.picocli.CommandLine;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Enumeration;

@Component
public class GetUserIdInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String userId = request.getHeader("userId");
        if (StringUtils.isNotEmpty(userId)) {
            //如果不为空，则把userId存入ThreadLocal中
            UserContext.setUserId(Long.valueOf(userId));
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserContext.removeUserId();
    }
}
